S-90276A117 4-40 x 1 1/4" ASME B18.6.3 Steel Round Head Slotted Screws
Steel Round Head Slotted Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
- Exceptional 60,000 psi tensile strength ensures reliable fastening under high-stress conditions without failure
- Rockwell B69 hardness rating provides excellent wear resistance and maintains thread integrity during repeated use
- Class 2A thread fit with UNC coarse threading enables quick assembly and reduces cross-threading risks in production lines
- Fully threaded 1-1/4" length delivers maximum grip and holding power across the entire fastener engagement
- Slotted rounded head design allows for easy installation with standard tools while providing a low-profile finished appearance
- Comprehensive regulatory compliance including ASME B18.6.3, RoHS 3, and REACH ensures material safety and quality consistency
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head slotted screws address critical engineering challenges in industrial assembly operations. The combination of coarse thread design and Class 2A thread fit significantly reduces installation time while preventing thread stripping in soft materials or pre-tapped holes. The zinc-plated surface treatment creates a protective barrier against oxidation and chemical exposure, making these industrial screws ideal for electrical enclosures, machinery panels, and outdoor equipment where environmental resistance is essential. With full threading along the 1-1/4" length, these fasteners distribute clamping force evenly, preventing joint loosening from vibration - a common failure point in manufacturing and automotive applications.
Specification Summary & Compliance
Manufactured to precise inch system measurements with Class 2A thread tolerance per UNC standards, ensuring consistent fit and performance. These right-hand threaded screws comply with ASME B18.6.3 manufacturing specifications for dimensional accuracy and quality. Environmental compliance includes RoHS 3 (2015/863/EU) for restricted substance control and REACH (EC 1907/2006) regulations, confirming material safety for global industrial markets.
